as we've seen, Tony Stark is a classic rock fan, so that will probably get a nod. I can see various folks being on the IM3 soundtrack. Maybe they can get a Led Zeppelin reunion together, contribute a new song to it.

Nah, Robert Plant doesn't want to do anything with Led Zeppelin anymore, so they definitaly won't. Even if they did, John Bonham is dead, anyone who knows Led Zeppelin knows that Led Zeppelin isn't Zeppelin without Bonzo. His presence is so freakin ridiculous.

I would expect more ac/dc

however, if they good get some old led zeppelin songs in, that would be cool, like...after stark has his troubles, before he gets ready for a final battle,thiis song could certainly work, with the intro, and the words are..sort of appropriate/

AC/DC has become a Stark motif, but that's all getting tired and old, just like the band.

Might be nice to bring in some fresher hard rock/metal, to signal a change in Stark's personality and to quit making him be stuck in the past. Something like Wolfmother, Kasabian, Queens of the Stone Age, System of a Down, Disturbed, or even some thrash from Metallica or Megadeth could make him a more hip rocker, instead of a dadrocker.

That being said, I think it *would* be cool as hell at some point to include Paul McCartney and Wings' "Magneto and Titanium Man" on the soundtrack.